三量子位Heisenberg XX链中杂质对纠缠的影响  

The effect of impurity on the entanglement between the normal lattice in three-qubit Heisenberg XX chain

作　　者：张涛[1] 惠小强[2] 岳瑞宏[1] 

机构地区：[1]西北大学现代物理研究所,西安710069 [2]西安邮电学院应用数理系,西安710061

出　　处：《物理学报》2004年第8期2755-2760,共6页Acta Physica Sinica

摘　　要：研究了有杂质时三量子位HeisenbergXX链中正常格点之间的热纠缠情况 ,给出了Concurrence的解析表达式 .进一步的讨论发现 ,杂质对正常格点的热纠缠有着重要的影响 ,甚至能够改变纠缠在反铁磁区的特性 .理论表明 。In this paper,we study the effect of impurity on the thermal entanglement between the normal lattice in three qubit Heisenberg XX chain,and give the analytical expression of the concurrence.According to the discussion of our result,we find that the impurity parameter has a great effect on the pairwise thermal entanglement,it even can change the characters of the entanglement to some degree.

关 键 词：HEISENBERG XX链 杂质格点 热纠缠 量子信息论 量子态纠缠 Concurrence计算 

分 类 号：O413.1[理学—理论物理]